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Artemisia pycnocephala

coastal sagewort

Asteraceae

Pacific coast (California to Oregon)

Deer Resistant Drought Tolerant Fragrant (moderate)Container Friendly

Native to North America

SunFull Sun

WaterLow · drought-tolerant

HardinessZones 8–10

Overview

Artemisia pycnocephala is a low, mounding perennial subshrub growing 1-2 feet (30-60 cm) tall and 2-3 feet (60-90 cm) wide, with soft, silvery-grey foliage. The leaves are 0.5-1.5 inches (1-4 cm) long and finely divided into narrow segments densely covered with short, soft hairs that give the whole plant a felted, pale appearance. Stems are woody at the base and herbaceous toward the tips, forming a rounded cushion. Small flower heads are crowded into dense, rounded clusters along upright stalks in summer and autumn; the heads are yellowish to grey-green and inconspicuous against the foliage. The plant is aromatic, releasing a sage-like scent when the leaves are brushed. It grows on coastal dunes, bluffs, and sandy flats along the immediate Pacific shore. Plants are short-lived, often persisting only three to five years before declining, and tend to open at the centre with age. The silvery colour fades and growth becomes leggy in shade or rich soil, so the species holds its form only in full sun and lean, sandy ground.

Native Range

Artemisia pycnocephala is native to the Pacific coast of North America, from northern California north to Oregon. It grows almost exclusively on coastal dunes and sandy bluffs within reach of ocean spray.

Suggested Uses

Used in coastal and dune gardens, rock gardens, and dry borders for silver foliage and texture, spaced 24-36 inches (60-90 cm) apart. Suited to seaside plantings exposed to wind and salt, and to gravel gardens with sharp drainage. The aromatic foliage is generally passed over by deer.

How to Identify

Recognised by its low, mounded form of silvery-grey, finely dissected foliage with a felted texture and a sage-like scent. Dense, rounded clusters of small yellowish-green flower heads sit on upright stalks above the leaves in summer. Its compact coastal habit and woody base separate it from taller, greener wormwoods.

Appearance

Size & Dimensions

Height1' - 2'

Width/Spread2' - 3'

Reaches mature size in approximately 2 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~16 weeks

Summer Fall

Flower heads appear from June through September in dense terminal clusters. The yellowish-green heads are small and blend with the grey foliage rather than standing out. Seed ripens in autumn and the flowering stalks then die back to the mound.

Detailed Descriptions

Foliage Description

silvery-grey

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-12 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 7.5(Neutral)

357912

Soil Types

sand

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

1-2 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Artemisia pycnocephala grows in full sun and sandy, fast-draining soil with low fertility. It tolerates salt spray, wind, and drought once established, and needs little or no summer water in its native coastal climate. Rich soil, shade, or regular irrigation cause loose, leggy growth and a loss of the silver colour. Light shearing in early spring keeps the mound dense and removes winter-worn growth. Plants are short-lived and are often replaced every few years as they open at the centre. Sharp drainage matters in wetter climates, where wet winter soil shortens the plant's life.

Pruning

The mound is sheared back by about one third in early spring to remove old growth and keep a dense form. Cutting into bare, leafless wood is avoided, since old wood is slow to resprout. A second light trim after flowering removes spent stalks.

Pruning Schedule

early spring